Created attachment 285281 [details] ebuild patch With USE="python" gnucash installs a Python package which is not compiled. Attached patch to the ebuild does this for me.
Created attachment 285363 [details, diff] ebuild patch
+ 10 Sep 2011; Pacho Ramos <pacho@gentoo.org> gnucash-2.4.7.ebuild: + Fix python modules installation, bug #381477 by Chris Mayo. +